6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 power to fuel pump wiring issue
Reported or suspected cause
feed supply
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Leading evidence: 'feed supply' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'feed supply' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check fuel pump/sender wiring' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
The link though did make sure I check the plug and wiring which appears to be good.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
I thought rather than disassembling the entire thing I would confirm whether or not it’s the fuel pump first by running the fuel pump and checking the pressure at the feed line.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
I thought rather than disassembling the entire thing I would confirm whether or not it’s the fuel pump first by running the fuel pump and checking the pressure at the feed line.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
I thought rather than disassembling the entire thing I would confirm whether or not it’s the fuel pump first by running the fuel pump and checking the pressure at the feed line.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261026T212127Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi everyone, I am new to the scene after recently purchasing my 1999 996.1 c4
I got to the car as a non runner. I was talking to a chap and I mentioned what was happening (wont run off the key but will if there is a live to the pump)
He pointed me in the direction of his forum and said to look into the ignition switch as these can be a common problem. Can anyone point me in the direction of a quality replacement? Also any thoughts on the matter? It's had a new pump fitted.
Many thanks,
Claz
If the car runs with a seperate 12 volt feed to the pump then the pump is ok .. your issue is with the feed supply to the pump ..
You have a fuse , a relay and some wiring .. Images below of the wiring , fuse and relay locations .
I kinda doubt an ignition switch issue as its not just the pump that would have no power but half of the sensors on the engine as they are all interlinked via splice points .. ie 1 feed wire is split into several feed wires for different items .
Check the fuse .. always a good start .. then pull the relay .. bridge term 30 with 87 .. does the car run .. yes .. the relay is at fault or the switch feeds to energise the relay are at fault .
If no then check there is a 12 volt supply at term 30 .. yes and there is a wiring issue from relay to the pump .
No and trace back the feed wire .
Workshop manual including wiring diagrams for your car can be downloaded from here ..
http://911uk.com/viewtopic.php?t=83491
relay support 1 is above the fuse box .. pay careful attention to the numbers on it and make sure you get the correct relay .. easy to get the wrong one .
I would like to test the pressure directly from the fuel pump outlet (already checked at the filter in the engine bay and found it to be low). I thought rather than disassembling the entire thing I would confirm whether or not it’s the fuel pump first by running the fuel pump and checking the pressure at the feed line.
I guess if I connect a couple of fly leads to the connector on the top of the pump to a battery I can read the pressure as it runs. Can anyone please confirm where I need to connect the positive and negative?
thread merge plus check out
Check Your Fuel Pump/Sender Wiring! Repair guide inside. - Rennlist - Porsche Discussion Forums
996 Turbo Forum - Check Your Fuel Pump/Sender Wiring! Repair guide inside. - All, As many of you know, the wiring of our fuel systems has a tendency to overheat, particularly as the fuel pump ages. This well-documented phenomenon can cause the fuel sender's black plastic electrical connector to...
rennlist.com
Thank you, though I can’t determine from that schematic which should be positive and negative. It may not matter? My assumption is that the line from the relay will be the +
The link though did make sure I check the plug and wiring which appears to be good.
This is a source reference. Confirm exact model applicability in the original material.
